Novel Fork Architectures of Ag₂S Nanoparticles Synthesized through In Situ Self-Assembly inside Chitosan Matrix

Abstract:

In a simple reaction between Silver nitrate and Thiourea under the presence of Chitosan, novel fork architectures of silver sulfide (Ag₂S) were obtained through In-situ self-assembly of Ag₂S nanoparticles inside Chitosan matrix in aqueous basic environment. Samples were characterized by SEM, TEM, XRD, FTIR, Raman Spectroscopy and UV-vis Spectroscopy. Average particle size was found to be 8 nm from TEM analysis. Formation of crystalline monoclinic α-Ag₂S was confirmed by SAED and X-ray diffraction analysis. The experimental results show that the fork architectures of Ag₂S can be obtained from Tape like assemblies of Ag₂S nanoparticles at the later stage of their growth with temperature. Raman spectra confirm the incorporation of Ag₂S nanoparticles inside Chitosan matrix. Multiple resonant Raman peaks indicates that the yielded Ag₂S nanoparticles possess good optical quality and crystalinity. FTIR spectra indicates that the Ag ⁺ ion is coupled with the C=O bond of the Chitosan molecules through the electrostatic interaction. UV-vis absorption spectrum of the Ag₂S Fork architectures has a broad absorption band in the UV to visible region, and the blue-shifting of the band is observed along with the presence of both direct and indirect band gap.

• Periodical: Nano Hybrids (Volume 1)
• Pages: 23-43
• DOI: https://doi.org/10.4028/www.scientific.net/NH.1.23
• Online since: May 2012
• Authors: Lubna Aamir, Prabha Sana, M.M. Malik, A.H. Siddiqui, M.S. Qureshi
• Keywords: Ag₂S Nanoparticles, Ag₂S-Chitosan, Chitosan, Fork Structure, Self-Assembly

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